chore: import upstream snapshot with attribution

python/paddle/optim/__init__.py

@@ -0,0 +1,80 @@
+# Copyright (c) 2026 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys as _sys
+
+from paddle.optimizer import (
+    ASGD as ASGD,
+    LBFGS as LBFGS,
+    SGD as SGD,
+    Adadelta as Adadelta,
+    Adagrad as Adagrad,
+    Adam as Adam,
+    Adamax as Adamax,
+    AdamW as AdamW,
+    Muon as Muon,
+    NAdam as NAdam,
+    Optimizer as Optimizer,
+    RAdam as RAdam,
+    RMSProp as RMSProp,
+    Rprop as Rprop,
+    adadelta,
+    adagrad,
+    adam,
+    adamax,
+    adamw,
+    asgd,
+    lbfgs,
+    muon,
+    nadam,
+    optimizer,
+    radam,
+    rmsprop,
+    rprop,
+    sgd,
+)
+
+from . import lr_scheduler  # noqa: F401
+
+_sys.modules['paddle.optim.adadelta'] = adadelta
+_sys.modules['paddle.optim.adagrad'] = adagrad
+_sys.modules['paddle.optim.adam'] = adam
+_sys.modules['paddle.optim.adamax'] = adamax
+_sys.modules['paddle.optim.adamw'] = adamw
+_sys.modules['paddle.optim.asgd'] = asgd
+_sys.modules['paddle.optim.lbfgs'] = lbfgs
+_sys.modules['paddle.optim.muon'] = muon
+_sys.modules['paddle.optim.nadam'] = nadam
+_sys.modules['paddle.optim.optimizer'] = optimizer
+_sys.modules['paddle.optim.radam'] = radam
+_sys.modules['paddle.optim.rmsprop'] = rmsprop
+_sys.modules['paddle.optim.rprop'] = rprop
+_sys.modules['paddle.optim.sgd'] = sgd
+
+__all__ = [
+    "Adadelta",
+    "Adagrad",
+    "Adam",
+    "Adamax",
+    "AdamW",
+    "ASGD",
+    "LBFGS",
+    "Muon",
+    "NAdam",
+    "Optimizer",
+    "RAdam",
+    "RMSProp",
+    "Rprop",
+    "SGD",
+]